Blender before 4.5.15 and 5.x before 5.2.3 Heap Buffer Overflow via Thumbnail Extraction

Summary

Blender before 4.5.15 and 5.x before 5.2.3 contains a heap buffer overflow vulnerability in the blend file thumbnail extractor caused by 32-bit integer overflow in thumb_data_vertical_flip(). Attackers can craft a .blend file with malicious TEST block dimensions that trigger an out-of-bounds write when blender-thumbnailer or the Windows shell extension previews it, causing crashes or code execution.

Remediation

1. Inventory every Blender Foundation Blender deployment, including staging.
2. Upgrade Blender Foundation Blender to the fixed version for your release line, listed under Affected versions.
3. Confirm the running version after the upgrade.

References

• Patchhttps://projects.blender.org/blender/blender/commit/71c10a0217d5e331b215b76773ad23b64974bd97
• Patchhttps://projects.blender.org/blender/blender/commit/d723c68112d216099c9b24dab5c8440bab7add08
• Patchhttps://projects.blender.org/blender/blender/pulls/164279
• Advisoryhttps://www.vulncheck.com/advisories/blender-before-4.5.15-and-5-x-before-5.2.3-heap-buffer-overflow-via-thumbnail-extraction
• Referencehttps://projects.blender.org/blender/blender